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Remedy in case of faults
Type of malfunction
Piston rod moves up and
down quickly.
Piston rod moves up and
down slowly when the spray
gun is closed.
Not enough pressure to the
spray gun.
Piston rod sputters when
stroking upward or down-
ward.
48
Possible cause
Suction tube projects over
the fluid level and sucks in
air.
Coating material viscosity is
too high, preventing it from
being sucked up.
Ball in inlet valve housing is
stuck.
Loose connections.
Relief valve is not closed
completely.
Relief valve worn.
Lower packing worn.
Ball in inlet valve housing
and ball in outlet valve seat
are not sealing properly.
Tip is worn.
Filter cartridge in high-
pressure filter is clogged.
High-pressure hose is too
long.
Solvent has made the upper
packing expand.
GB
Measure for elimination of malfunction
Refill the coating material
Thin out the coating material according to manufactur-
er's instructions.
Vent air from material feed pump and turn the relief
valve knob to the left (k Circulation).
Dismantle inlet valve housing, clean ball and valve
seat. Check all connections between the material feed
pump and spray gun.
Turn relief valve handle (3) fully clockwise (p spray).
Replace
If the measures described above do not help, replace
lower packing.
Dismantle inlet valve housing and outlet valve seat.
Clean balls and valve seats.
Replace
Clean or replace the filter cartridge.
Reduce length.
Replace upper packing.
HC 920 • HC 940 • HC 960
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